Spinning box



Patented 1m 21, 1942 SPINNING BOX Henry J. McDermott, Prospect Park, Pas, asslgnor I to American Viscose Corporation, Wilmingto Del., a corporation of Delaware Application October 28, 1941, Serial No. 416,796

is Claims.

This invention relates to cover-locking devices formaintaining the cover in place during high speed rotation of spinning buckets, such as are employed in collecting artificial thread freshly spun during the manufacture from viscose.

It is an object of the invention to provide looking means on the cover which are normally positioned within the limits defined by the periphery of the cover but which are adapted to be thrown outwardly to engage the inner periphery of the upper rim of the spinning bucket during rotation thereof and having a means resiliently returning the locking means to normal position upon stopping of the rotation of the bucket. It is a further object of the invention to provide such a locking means which has a minimum amount of area offering frictional resistance to movements thereof relative to the cover during locking and return movements. Further objects of the invention will be apparent from the description and the drawing.

In the drawing, illustrative of the invention,

Figure 1 is a cross-sectional elevation view partly broken away showing the invention, and

Figure 2 is a similar cross-sectional elevation partly broken away showing a modification thereof.

As shown in Figures 1 and 2, the spinning bucket 2 is provided on the inner periphery of the rim with a ledge 3 upon which a cover 4 rests. The spinning bucket may be of any standard form and may have perforations for the discharge of liquids introduced therein by the threads or filaments being wound within the spinning box, one such perforation being shown at 5. Theinside periphery of the upper rim of the spinning bucket is also provided with a substantially annular groove 6 of semi-cylindrical cross-section. The outer periphery of the cover 4 is provided with an annular groove 1 which has a semi-circular cross-section at its deepest portion which is joined by horizontal surfaces to the periphery of the cover. The maximum depth of the groove in the cover 4 is made at least as large as twice the radius of the semi-circular cross- 8 are in a condition of no strain with the coils as close together as possible, it will fit within the groove 1 of the cover in such a manner that it will be confined within the limits oi the outer periphery of the cover.

In Figure 2, the locking ring is composed of a coil spring 8 embedded or molded within a solid elastic body l0. As in Figure 1, the ring of Figure 2 is so constructed that it will lie within groove 1 when the coils of the spring 8 are completely relaxed and as close together as possible.

In operation of the device, the cover is provided with the locking ring which is confined entirely within the outer periphery of the cover so that the cover may be readily put in place on the bucket, and upon rotation of the bucket, the ring expands as a result of the elastic nature of the spring 8 and the covering or body surrounding it, such expansion being caused by the centrifugal action resulting from the rotation of the bucket and cover. Upon stopping of the rotation of the bucket, the ring is returned to its normal 7 position entirely within the confines of the outer periphery of the cover so that the cover may be readily removed without forcing any of the parts.

The construction of ring is such as to cooperate section of the groove in the cover or of that in the bucket, which are preferably substantially the same. An annular band of substantially circular cross-section and composed of a helical metallic spring 8 completely surrounded by the elastic covering 9 of rubber, synthetic rubber, or synthetic resins, constitutes the locking means for the cover. The annular locking means is made so that when the helical coils of the spring with the grooves formed in the cover and spinning bucket with a maximum of efilciency. The circular cross-section provides for a minimum of area engaging the horizontal surfaces of the groove within the cover during the movement to bucket-engaging position by virtue of centrifugal force and also the return movement resulting from the spring action. The elastic covering 8 or the elastic body III provide a very smooth surface and act to protect the metallic spring from any corrosive chemicals that might otherwise find access thereto and cause rapid decomposition thereof. For this reason, the metallic spring may be made of metals which are not highly resistant to chemicals with just as great advantage as from corrosion resistant metals. While the clastic covering or body of which the locking ring is composed are capable of and probably do exert some elastic force tending to return the ring to its normal position upon stopping of the bucket, this function is more advantageously taken over mainly by the spring encased therein. The employment of the metallic spring assures far greater resiliency and permanence of the liveliness of the locking ring, such as would not be obtained by employing rings composed solely of elastic materials, such as rubber, synthetic rubbers, or synthetic resins, whose liveliness tend to become greatly reduced or lost in spite or the general stability 01 such materials in other respects. To summarize, the invention provides a locking ring having great resiliency lite, and a small and substantially permanently smooth triotional contact area, thereby preventing any tendency for the locking ring to stick in the bucketengaging position and remain there even after stopping of the bucket.

While a preferred embodiment of the invention has been disclosed, the description is intended to be illustrative only. and it is to be understood that changes and variations may be made without departing irom the spirit or scope of the invention as deiined by the appended claims.

What I claim is:

l. A spinning bucket provided on the upper portion of its inner periphery with an annular groove. a cover having an annular groove in its outer periphery, a locking ring normally retained in substantially unstressed condition entirely within the groove in the cover and adapted to expand into engagement with the groove in the bucket upon rotation thereof, said locking ring comprising a metallic spring encased within a protective covering of an elastic material.

2. A spinning bucket provided On the upper portion of its inner periphery with an annular groove having a substantially semi-circular crosssection, a cover having an annular groove in its outer periphery, a locking ring normally retained in its substantially unstressed condition entirely within the groove in the cover and adapted to expand into engagement with the groove in the bucket upon rotation thereof, said locking ring comprising a metallic helically-coiied spring encased within a protective covering of an elastic material, said ring having an overall circular cross-section providing thereby a minimum of area offering frictional contact with the surfaces go of the groove in the cover.

HENRY J. MCDERMOTT. 

